PowerLab 6 not initializing

I've had my PowerLab 6 for about three years now and it's worked without fail until today. I plugged in a multistar 4S 10ah battery and it gave a slight spark on the charge board, which I didn't think much of because I've had batteries including this one cause a little spark when being plugged in. Then I went to turn on the power supply for the PowerLab and although the LCD screen lit up all it showed was a row of pound signs (hash symbols). There were no beeps. It does not progress beyond this point so a I can no longer charge anything with it. Is it dead? Any ideas?